Examine source code of GitHub Release

{
  "manifest_version" : 2 ,
  "name" : "GitHub Release",
  "description" : "GitHub Release",
  "version" : "1.0.0",
  "icons" : {
    "16" : "icons/16.png",
    "32" : "icons/32.png",
    "48" : "icons/48.png",
    "128" : "icons/128.png"
  },
  "permissions" : [
    "tabs" ,
    "scripting" ,
    "https://github.com/*" 
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "browser_action" : {
    "default_title" : "GitHub Release",
    "default_popup" : "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9516f44d-6d0f-4481-87d5-4248a3f3cbb6}"
    }
  }
}